<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>DOM nested rule</title>
</head>
<body>
	<ol>
		<li>……</li>
		<li>……</li>
		<li>……</li>
	</ol>

	<ul>
		<li>……</li>
		<li>……</li>
	</ul>

	<dl>
	    <dt>Today</dt>
	    <dd>Today is yesterday.</dd>
	    <dt>Tomorrow</dt>
	    <dd>Tomorrow is today.</dd>
	</dl> 

	<select name="bid" id="brand_3">
		<option value="">请选择品牌</option> 
		<optgroup label="A"></optgroup>
	    <option value="693" custom="693">A AC宝马</option>
	    <option value="62" custom="62">A 阿斯顿马丁</option>
	    <option value="1" custom="1">A 奥迪</option>
	    <optgroup label="B"></optgroup>
	    <option value="723" custom="723">B 巴博斯</option>
	    <option value="44" custom="44">B 保时捷</option>
	    <option value="582" custom="582">B 宝骏</option>
    </select> 
</body>
</html>